An organic compound with the molecule ${\mathrm{C}}_9{\mathrm{H}}_{10}\mathrm{O}$ forms a 2, 4 – DNP derivative, reduces Tollen’s reagent and undergoes cannizaro reaction, on ${\mathrm{KMnO}}_4$ oxidation it gives 1, 2 – benzene dicarboxylic acid. Structure of organic compound is 

It is a carbonyl compound because it gives positive 2,4-DNP test.

It is an aldehyde because it gives positive Tollen's test.

It should not contain $\mathrm{\alpha }$-hydrogen atom because it gives cannizaro reaction.

There must two groups ortho to each which get oxidized to -COOH gps with acidified Pot.permanganate.